Demi Lovato has reportedly become the first X Factor USA judge this season to be on the receiving end of an angry reject's rant.
Tweets sent out by audience members during this week's taping in Austin, Texas, allege that the hopeful was ordered to leave by Simon Cowell after the brief altercation.
The 50-year-old contestant apparently sang a sexually-charged, self-written song to a 16-year-old in the audience, prompting a negative reaction from the crowd.
Lovato, famous for her three studio albums and roles in the Disney productions Camp Rock and Sonny With A Chance, admitted afterwards that he creeped her out. "I just can't," she said.
As was previously reported, Britney said: "I want to know why let you on stage. I left uncomfortable with you even being on stage looking at me right now."
When Demi then told him he couldn't sing, he angrily accused her of using autotune in her own music.
An audience member revealed on Twitter: "DEMI JUST TOLD HIM HE COULDN'T SING. HE SAID THAT'S WHY YOU USED AUTO (TUNE) AND I DON'T. TO DEMI (sic)"
Demi reportedly barked back: "No I don't", before Simon told him to get off the stage.
"You need to leave now," added LA.
Demi then yelled after him again as he left the stage, talking to teenage girls as he left.
Demi makes her debut